If your website is managed by a webmaster, you should contact your webmaster on the subject.
If your site is not managed by a webmaster, search engines such as Google and Bing will automatically find your website after approximately one month.
Adding relevant links in relevant locations on your website will speed up the process and help search engines find your website.
An immediate way to make your website indexed by search engines is to sign up for a search engines webmaster tools.
See also